Infrared "X-Ray"
This is the coolest thing I've seen in a while. The device bounces infrared light off the human body and records the light reflected back. Different tissues absorb and reflect different amounts of IR light. The computer then uses a DLP projector to display a real-time image on the surface of the skin that gives the illusion of peering under the skin. Another video gives a brief explanation of how it works. Excellent for aiding in starting IVs or checking for broken bones.